Last day, Notcom, developer of popular TinyUmbrella software, announced that he will adding iOS 4.3 GM support to TinyUmbrella and will release an updated version that day itself. And, he has released TinyUmbrella 4.21.13 to save iOS 4.3 GM SHSH blobs and is available to download.
He has also added support to use your proxy settings while running the TinyUmbrella loader. This is what he said in his blog :
This update provides iOS 4.3 GM support as well as uses your system proxy settings when launching the TinyUmbrella loader. I’ve also made a few tweaks to streamline the currently saved shshs. I’m still working on the windows recovery kick out fix for 4.2.1 – I should have that finished this week (hopefully). Enjoy